| Figure 1. A. Longitudinal, schematically cross-section of Arionoceras submoniliforme (Meneghini 1857), B. The same as above of Arionoceras affine (Meneghini 1857), C. Particular enlarged of the characteristic septal neck (see text).
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| Figure 1. A. Longitudinal, schematically cross-section of Arionoceras submoniliforme (Meneghini 1857), B. The same as above of Arionoceras affine (Meneghini 1857), C. Particular enlarged of the characteristic septal neck (see text).
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